Find numbers that are either squares or cubes.

Help Fran remember how much money she loaned each friend.

Can you produce exactly 3 gallons of water? 

How much does a man make or lose in the horse-trading business?

What happened to the other dollar?

Make the sum of all rows equal the same number.

Make the sum of each of the rows equal certain numbers.  In the hexagons below, place the numbers…

Make the sum of the numbers in the rows, columns, and diagonals of a grid all equal the…

Will the sum of four numbers always be the same?

Consider the use of the word “below” for negative numbers.